Answers_to_PROB_SET_1

Answers_to_PROB_SET_1 - CEM 251 Spring 2008 Answers 1st...

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CEM 251 Spring 2008 Answers 1st Problem Set (Chapters 1-6) 1. a) 7 b) 3 c) 1 d) Sp e) Sp 2 f) 28 g) 4 h) C 11 H 14 BrNO 2. CH 2 N N -1 +1 0 3. a) Carbocation: (Zero electrons on central carbon) Carbon radical: (one electron on central carbon) Carbanion: (two electrons on central carbon) b) There are three s bonds on the central atom in all cases. 4. How many of the methyl groups will occupy an equatorial position in the more stable chair conformation of the following molecules? Which configuration should be most stable of the four? CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 I II III IV a,a,e,e a,a,a,a a,a,e,e a,e,e,e e,e,a,a e,e,e,e e,e,a,a e,a,a,a (2) (4) (2) (3) II is most stable.
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5. H CH 3 CH 3 H H CH CH 3 CH 3 CH 2 CH 2 CH 2 CH 3 C 2 C 3 a) CH 2 CH 2 CH 3 H CH 3 H CH 3 CH 2 H H CH 2 CH 3 H H CH 3 b) H H CH 2 CH 3 H H CH 3 H H H H c) d) CH 3 H CH 3 H H CH 3 H CH 3 x 6. a) conformational isomers b) configurational isomers c) constitutional isomers d) identical e) conformational isomers f) identical
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This note was uploaded on 04/02/2008 for the course CEM 251 taught by Professor Rathke during the Spring '07 term at Michigan State University.

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Answers_to_PROB_SET_1 - CEM 251 Spring 2008 Answers 1st...

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